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Calculations of Basic and Diluted Income per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share Disclosure [Line Items]    
Net loss– basic and diluted $ (4,867) $ (11,598)
Weighted-average shares outstanding – basic and diluted 20,510 16,601
Basic and diluted loss per common share $ (0.24) $ (0.70)